Moderation and Possibility Storm on the battlefield.
Steps
Cast Fractured Identity by paying ({3} magic symbol) ({W} magic symbol) ({U} magic symbol) , exiling Moderation and causing each opponent to create a token copy of it.
Any time an opponent would cast a spell, Possibility Storm exiles that spell and reveals cards until you find one they could cast.
The opponent's Moderation prevents them from casting a second spell resulting in a lock.